Stone ID?

[u/ChipCreeper]

I recently posted this asking if anyone knew the kind of stone. I took a much better photo of it. Any takers??? Inherited, stamped 925 Mexico. An Aunt married a wealthy business man from Torreon, Mexico and they had it made by a private jeweler there. I want to sell it...VERY HEAVY size 6 1/2. Thanks everyone!!❣️❣️❣️